Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
a) Asn χ1 vs. χ2 points for the commonly occurring classes of local side-chain-backbone H bonds: i−4 (gray squares), i (•), and i+2 or i+3 (▵). Contours (at 2, 4, 8, 16, and 32) represent the smoothed distribution for all Asn. (b) Superimposed examples of the two different Asn conformations that make H-bonded helix N-caps. In pink is Asn-22 of 256B with β φ, ψ values and a p30° rotamer, and in green is Asn-153 of 1IXH with poly(Pro) φ,ψ values and a t−20° rotamer.
